Extended gun audit for M24

[ghost]

Summary

SUMMARY: Content "M24 adjusted to real life version"

Purpose of change

Closes #39350, helps #37374.

Describe the solution

1. Audit gun volume and weight.
2. Remove compatibility with M14 magazines, change to RL 5 rnd internal magazine.
3. Change default mods to rifle scope and bipod, per the SWS specifications.
4. Added RELOAD_ONE flag, since that's how non-A2s are reloaded.
5. Removed the M14 magazine from Police Sniper profession.

Describe alternatives you've considered

Changing it to an M24A2(detachable mags, raised cheekpiece stock).

Testing

Spawned in legacy M24, saved and quit. Applied changes.

1. The M14 magazine is still loaded in the rifle.
2. Players can magdump if it's still loaded, but attempting to reload it puts it in the internal clip and requires unloading the magazine to continue firing. The unloading changes the M24 to use its internal clip and refuse to allow M14 magazines.

Loaded in as Police Sniper, as well.

Additional context

M24, OAL 44" and weight 11lb: https://www.remingtondefense.com/sniper-rifles/m24/25732.html
SWS comes with bipod and scope, not cheek pad: https://www.remingtondefense.com/sniper-rifles/m24/25727.html
SA: https://imgur.com/a/n9sQBA9
Width of 2.27" from Stocky's measurement of H-S Precision stocks, which is the company the military uses: https://www.stockysstocks.com/stock-finder/remington/model-700/hinged-floorplate/h-s-precision-pro-series-m24-vertical-grip-varmint-tactical-remington-700-winchester-70-stocks-fixed-pst-035-036-053-055.html

Police Sniper loadout without m14 magazine: